JP2808417B2 - Control circuit cooling structure of hot water circulation pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit for controlling a motor for driving a hot water circulation pump, and more particularly to a cooling structure for an electronic component generating a large amount of heat.

[0002]

2. Description of the Related Art FIG. 3 is a cross-sectional view of a hot water circulating pump used in a hot water circulating system in a bathtub and the like which has been generally put into practical use. As shown in the figure, the pump has a drive motor 3, a control circuit 4 for controlling the drive motor 3, and a drive circuit 3 inside a jacket formed by a motor casing 1 and a pump casing 2. Stator 3-1
And a canister 5 for isolating a stator chamber for accommodating the rotor 3-2 and a rotor chamber for accommodating the same rotor 3-2, and an impeller 6 directly connected to the rotor 3-2. Pressure is applied to the pumped liquid through the window of the partition plate 7 between the chamber and the rotor chamber, and the pumped liquid is sent from the water supply port 8 to a pipe (not shown) which is a pumping circuit.

A control circuit 4 for the driving motor 3 disposed inside the motor casing 1 is disposed inside the motor casing bottom portion 1-1, and the electronic components 4 that have a high temperature rise due to operating current due to miniaturization. 1 generally mounts some kind of heat radiating member as a means for enhancing the heat radiating effect. In the example shown in the figure, the motor casing 1 itself is used as the heat radiating member.
By disposing the heat-generating electronic component 4-1 in close contact with the inner surface of the motor, heat is radiated through the motor casing 1.

[0004]

The cooling structure of the heat-generating electronic component according to the prior art described above has a limited heat dissipation effect because the heat dissipation from the heat radiating member is spontaneous dissipation into the air. The present invention has been made to solve the above problems, and has as its object to realize a highly reliable cooling structure using a circulating pumped liquid as a cooling medium.

[0005]

According to the cooling structure of the control circuit of the hot water circulation pump according to the present invention, the head of the heat-generating electronic component is arranged in close contact with the inner surface of the bottom of the motor casing, while the middle part of the piping of the pumping passage. A water-cooling jacket is provided at a position, and an opening of the water-cooling jacket is disposed in close contact with the outer surface of the bottom of the motor casing, or an opening is formed at the bottom of the motor casing. The water cooling jacket is configured to penetrate the opening and to be closely attached to the side wall of the water cooling jacket.

[0006]

[Operation] With the above-described configuration, the heat-generating electronic components are directly in contact with the motor casing or the side wall of the water-cooling jacket and / or mounted via a heat-dissipating member, and the circulating pumped liquid is used as a heat-dissipating medium, thereby dissipating heat. A highly effective cooling structure can be realized.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal section of a first embodiment according to the present invention. Among the electronic components constituting the control circuit 4, an electronic component 4-1 which generates a large amount of heat is mounted on the inner surface of the motor casing bottom 1-1. The motor casing bottom 1
The outer surface of -1 is closely arranged so as to form a part 9-1 of the side wall of the water-cooling jacket 9 connected to the intermediate portion of the pipe 10 of the pumping passage.

The heat of the heat-generating electronic component 4-1 is opposed to the pumping liquid circulating in the water-cooling jacket 9 via the motor casing bottom 1-1 functioning as a heat radiating member. Due to the low temperature, the circulation effectively dissipates heat.

FIG. 2 is a longitudinal sectional view of the second embodiment. The water cooling jacket 9 provided in the pipe 10 of the liquid pumping passage has no opening, and the heat-generating electronic component 4-1 abuts on the side wall of the water cooling jacket 9. It is a configuration to be arranged. In FIG. 2, the heating electronic component 4-
1 shows a configuration in which a heat radiating member 4-2 is provided. As is clear from the drawing, the difference from the first example is the structure of the water-cooling jacket 9, and the first example is a motor casing as a part of the wall of the water-cooling jacket 9, which is a part of the circulation path of the pumped liquid. Since the bottom 1-1 is used, the side wall of the water cooling jacket 9 has a closed structure in order to eliminate the necessity of sealing means for the connection portion.

In any of the above-mentioned examples, it goes without saying that it is possible to freely use a heat-radiating member in combination with the heat-generating electronic component.

[0011]

As is clear from the above embodiments, the control circuit cooling structure of the hot water circulation pump according to the present invention utilizes a circulating pumping liquid whose temperature upper limit is limited as a cooling medium as a heat radiation medium. Because of the structure, there is an effect that a cooling structure having a large heat radiation effect and high reliability can be realized.

[0012]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first example of a control circuit cooling structure of a hot water circulation pump according to the present invention.

FIG. 2 is a longitudinal sectional view of a second example of the control circuit cooling structure of the hot water circulation pump according to the present invention.

FIG. 3 is a longitudinal sectional view of an example of a control circuit cooling structure of a hot water circulation pump according to the related art.

[Description of sign]

 1: Motor casing 1-1: Motor casing bottom 1-2: Through hole in the motor casing bottom 2: Pump casing 3: Drive motor 3-1: Stator 3-2: Rotor 4: Control circuit 4-1: Heat-generating electronic components 4-2: Heat radiation member 5: Can 6: Impeller 7: Partition plate 8: Water supply port 9: Water cooling jacket 9-1: Opening of water cooling jacket 9-2: Side wall of water cooling jacket 10: Piping

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04D 29/58 F04D 29/00 F04D 13/06

Claims (4)

(57) [Claims] 1. A drive motor, a control circuit for controlling the drive motor, and a stator chamber for accommodating a stator of the drive motor inside a jacket formed by a motor casing and a pump casing. The control circuit comprises a can for isolating a rotor chamber accommodating a rotor, and an impeller directly connected to the rotor, wherein the control circuit is configured in a control circuit cooling structure of a hot water circulation pump that starts operation by the control circuit. The head has a heat-generating electronic component whose head is in contact with the bottom inner surface of the motor casing, and a water-cooling jacket connected to an intermediate portion of the pipe of the liquid-passage passage, and the opening of the water-cooling jacket has the opening. A control circuit cooling structure for a hot water circulation pump, wherein the control circuit cooling structure is disposed in close contact with the outer surface of the bottom of the motor casing. 2. The heat-generating electronic component has a heat-dissipating member disposed in contact with an inner surface of a bottom portion of a motor casing.
The control circuit cooling structure of a hot water circulation pump according to claim 1, wherein: 3. A drive motor, a control circuit for controlling the drive motor, and a stator chamber for accommodating a stator of the drive motor inside a jacket formed by a motor casing and a pump casing. In a control circuit cooling structure of a hot water circulation pump, comprising a can for isolating a rotor chamber accommodating a rotor and an impeller directly connected to the rotor, and starting operation by the control circuit, a bottom portion of the motor casing An opening is formed at the bottom of the motor casing, and a water cooling jacket connected to an intermediate portion of the pipe of the pumping passage is provided. The heat-generating electronic component is closely attached to a side wall of the water cooling jacket through an opening at the bottom of the motor casing. And a control circuit cooling structure for the hot water circulation pump. 4. The control circuit cooling structure for a hot water circulation pump according to claim 3, wherein the heat-generating electronic component is disposed in close contact with a side wall of the water cooling jacket via a heat radiating member.